de·coy /ˈdiːkɔɪ/ noun [countableC]1 TRICK/DECEIVEsomeone or something that is used to trick someone into going somewhere or doing something, so that you can catch them, attack them etc 誘餌,用作誘餌的人Officer Langley acted as a decoy to catch the rapist. 警員蘭利充當誘餌來抓捕那名強奸犯。
—decoy /dɪˈkɔɪ/ verb [transitiveT]